Group 15 ligand migration in the heteronuclear clusters RuOs3(μ-H)2(CO)12(EPh3) (E = P, As, Sb)

The monosubstituted clusters RuOs3(μ-H)2(CO)12(EPh3) (where E = P, As, Sb) exhibit isomers in which the group 15 ligand is on an Os or an Ru vertex. Evidence is presented for hydride fluxionality and EPh3 ligand migration. These processes have been examined by variable temperature NMR studies, and the kinetic parameters estimated.